摘要:
Last week, n students participated in the annual programming contest of Marjar University. Students are labeled from 1 to n. They came to the competit 阅读全文
posted @ 2019-04-14 18:06
明霞
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摘要:
In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as a 阅读全文
posted @ 2019-04-14 17:27
明霞
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